Gustaw Paszkiewicz (1 April 1892 – 27 February 1955) was a soldier of the Imperial Russian Army, and officer of the Polish Army. He entered the military service in 1914, at the age of 22, fighting as Russian soldier in World War One. Paszkiewicz was a soldier until 1952.
Gustaw Paszkiewicz was born on 1 April 1892 in the village of Wasiliszki in the Vilna Governorate of the Russian Empire (present-day Belarus) to Leonard Paszkiewicz and Justyna née Tabenska. His younger brother Wilhelm was a colonel of the Polish Army, murdered by the NKVD in the Katyn massacre.
After graduation from a high school in Minsk, Paszkiewicz joined the Military College in Vilna. In 1914–1917 he fought in the Russian Army, and then joined Polish I Corps in Russia, in which he was company leader of the 3rd Rifles Regiment. He fought in the Polish-Soviet War in the area of Lwów and Stryj, as commandant of the 55th Infantry Regiment. In 1923–24, Paszkiewicz attended Wyższa Szkoła Wojenna in Warsaw, after which he was promoted to the rank of officer in the Polish General Staff. In 1924–1926, Paszkiewicz commanded Officer School of Infantry in Warsaw, and in October 1926 was named commandant of divisional infantry at 24th Infantry Division, stationed in Jarosław. On 12 October 1935 Paszkiewicz was named commandant of the 12th Infantry Division from Tarnopol.